How does everyone do it? I need to have some 4.5" holes for my 120mm PC fans, and in order to do that I need to buy a hole boring drill bit, a drill bit that the hole boring thing attaches to, and I need to rent a drill. Renting it cost $10/4 hours, $15/24 hours. The hole cutting bit is like $35, and the attachment bit is like $15. What the hell?! I can't return them either because it's obvious after they've been used. Is there a cheaper way, or do I just have to bite the bullet on this one?